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US 270: First established November 1926 Bureau of Public Roads revision for the US Highway System and was adopted in Dec 1926 as an official US route running from US 41 Murfreesboro (Main at Maney) via McMinnville to US 70 Sparta. This was an addition to the entirety of TN 1.
 US 270 Murfreesboro to Sparta via McMinnville 1927 National Map Tennessee in Nov 1927 started showing US 270 as US 70S on maps. AASHO eventually noticed US 70S on Tennessee maps and accepted their belated request to make this change in May 1929. Note that US 270 was never posted in Tennessee.
 US 70S Nashville to Sparta via Murfreesboro 1931 Clasons Today, the route US 270 followed is Main St out of Murfreesboro; Old Woodbury Pike through Readyville and Murfressboro Rd to Woodbury; US 70S through Woodbury; Old McMinnville Rd/abandoned routing east of Woodbury; US 70S through Cannon County except several abandoned alignments, plus Elkins Cir and Lincoln Ln
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